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3 years ago

Help me please!!!!!!!!!!!!!!!! (-7n^2-8n)+(-n^2+9n+9)

Mathematics

2 answers:

Sever21 [200]3 years ago

7 0

-9n^2+n+9 is the answer....

Setler [38]3 years ago

6 0

I combined like terms! I hoped this helps

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3 years ago

What type of decimal is this fraction: 11/20

Andre45 [30]

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3 years ago

Anthony has been saving nickels dimes quarters over the last year he knows that he has twice as many nickels as quarters. change

OLga [1]

Answer:

The number of nickel's coin is 150

The number of dime's coin is 35

The number of quarter's coin is 75

Step-by-step explanation:

Let

x ----> the number of nickel's coin

y ---> the number of dime's coin

z ---> the number of quarter's coin

Remember that

$1\ nickel=\$0.05$

$1\ dime=\$0.10$

$1\ quarter=\$0.25$

we know that

$x+y+z=260$ ----> equation A

$0.05x+0.10y+0.25z=29.75$ ----> equation B

$x=2z$ ----> equation C

substitute equation C in equation A and equation B

$2z+y+z=260$

$3z+y=260$ ---> equation A1

$0.05(2z)+0.10y+0.25z=29.75$

$0.35z+0.10y=29.75$ -----> equation B1

Solve the system of equations A1 and B1 by graphing

Remember that the solution is the intersection point both graphs

The solution is the point (75,35)

see the attached figure

z=75, y=35

<em>Find the value of x</em>

$x=2(75)=150$

therefore

The number of nickel's coin is 150

The number of dime's coin is 35

The number of quarter's coin is 75

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3 years ago

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3 years ago

Need help with full work quick

vekshin1

Answer:

Step-by-step explanation:

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She is right

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3 years ago